Can an insurance company raise your coverage without your knowledge or consent?

Yes, it is actually required that the insurance company reassess the value of your insured home on a regular basis. This is done as a safeguard for the homeowner. Home values change and materials and supplies to rebuild goes up. labor, materials, etc. Therefore, if some unfortunate event such as a fire should occur. And your home was insured at the value it was or ten years ago. You could be putting out some serious pocket money to make up the difference.

If you disagree with the insurance companies valuation you can contact them and have them review the policy or you can seek out another insurer.